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STL ASCII ↔ Binary Converter

Upload an STL file, auto-detect ASCII or Binary format, convert to the other format and compare file sizes. Fully browser-local.

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À propos de cet outil

STL files come in two formats: ASCII (human-readable text) and Binary (compact). This tool detects the current format and converts to the opposite. Binary STL is typically smaller and faster to load; ASCII is easier to debug.

Conseils d'utilisation

  • 1Format is auto-detected on upload
  • 2Binary STL is usually 4–5× smaller than ASCII
  • 3Geometry is preserved — only encoding changes
  • 4Preview your model in the 3D viewer before downloading

Mode d'emploi

1

Upload STL

Drop or browse for your .stl file

2

Review Detection

See detected format and file size in the sidebar

3

Convert

Toggle target format if needed — conversion runs automatically

4

Download

Download the converted STL and compare sizes

Questions fréquentes

Q

What's the difference between ASCII and Binary STL?

A

ASCII STL stores triangles as readable text; Binary STL stores them as compact binary data. Both represent the same geometry. Binary files are typically much smaller.

Q

Will conversion change my model geometry?

A

No. Only the file encoding changes. Triangle data is preserved through load and re-export.

Q

Which format should I use for 3D printing?

A

Both work with most slicers. Binary STL is preferred for large files due to smaller size and faster loading.

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